I have not seen this myself but there are reports that the file xpra.codecs.argb.argb.pyd is being told by some virus scanners that it contains
"Suspicious.Cloud.7.F"
Specifically Norton Antivirus is finding this.
And you are filing this instead of with Norton because?
Good question.
I see they have a form to report false positives so I will get the person who reported this to me to fill it out.
Closing this.
Another example here: #2088
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/527